The Eververse is collapsing under its own weight. The Dimensionauts, a ragtag collection of heroes, scientists, and anarchists from countless alternate realities, must band together and head towards the center of the Onion, the infinite-layered construct of all there is, was, and ever could be. Grant McKay created the Pillar to save the world with science, and now he must use it to save all worlds, all of creation, or doom reality itself to oblivion.